/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.api.*;
import axescon.xacml.model.policy.AttributeValue;

import java.util.logging.Logger;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities: implements Bag functions from
 *         see axescon.xacml 2.0 spec ch. A.3.12 Higher order Bag functions
 */
public class FnHOBagMap extends AbstractFn implements Fn {
    Logger log=Logger.getLogger(getClass().getName());

    public int getArgTypeListLength() {
        return 2;
    }

    public Liquid exec(Liquid[] args) throws
            ExpressionEvalIndeterminateException, XacmlException {
        AttributeValue[] ret = new AttributeValue[args[1].getBagUnsafe().length];

        Fn fn = getFnFactory().getFn(args[0].getSingularUnsafe().getStringValue());
        for (int i = 0; args[1].getBagUnsafe()!=null&&i < args[1].getBagUnsafe().length; i++) {
            ret[i] = fn.exec(new Liquid[]{new Liquid(args[1].getBagUnsafe()[i])}).getSingular();
        }
        return new Liquid(ret);

    }

    /**
     * result type of this function depends on the function (1st) argument,
     * and the actual type can be narrowed only AttributeValue[] bag
     * @return AttributeValue[].class
     * @throws ExpressionEvalIndeterminateException
     */
    public Class getReturnDataType() throws ExpressionEvalIndeterminateException{

        if(returnDataType==null){
                returnDataType=AttributeValue[].class;
        }
        return returnDataType;

    }

}
